Question

which is an immune response?
the iris of the eye narrows when the eyes are exposed to bright light.
langerhans cells transport harmful substances to white blood cells.
muscles under the skin contract rapidly to adjust the bodys internal temperature.
t cells signal b cells to adjust the ph of the blood.

Explanation:

An immune response involves the body's defense mechanisms against harmful substances. Langerhans cells are part of the immune - system and play a role in transporting antigens (harmful substances) to white blood cells for an immune reaction. The iris narrowing in bright light is a visual - reflex, muscle contraction for temperature regulation is a thermoregulatory response, and T - cells signaling B - cells to adjust blood pH is not a typical immune response.

Answer:

Langerhans cells transport harmful substances to white blood cells.